Pre-war doctrine also held that B-17 bombers could effectively bomb ships from high altitude, but attacks against Japanese ships by Flying Fortresses at Midway scored no hits.The Japanaese "Betty" horizontal bombers took one Helluva toll on U.S. ships early in the war: USS Pecos (oiler), USS Langley (our first aircraft carrier), USS Houston (Heavy Cruiser - knocked out after turret) just to name a few.
The Misubishi GM4 was probably one Japan's best combat aircraft of WW2. It was a versatile aircraft that preformed many roles.